X-ray stars observed in LAMOST spectral survey
Lu, Hong-peng1,2,3; Zhang, Li-yun1,2,3; Han, Xianming L.1,3,4; Shi, Jianrong5; Zhang, Li-yun, Email: liy_zhang@hotmail.com
2018-05-01
发表期刊ASTROPHYSICS AND SPACE SCIENCE
ISSN0004-640X
卷号363期号:5
摘要X-ray stars have been studied since the beginning of X-ray astronomy. Investigating and studying the chromospheric activity from X-ray stellar optical spectra is highly significant in providing insights into stellar magnetic activity. The big data of LAMOST survey provides an opportunity for researching stellar optical spectroscopic properties of X-ray stars. We inferred the physical properties of X-ray stellar sources from the analysis of LAMOST spectra. First, we cross-matched the X-ray stellar catalogue (12254 X-ray stars) from ARXA with LAMOST data release 3 (DR3), and obtained 984 good spectra from 713 X-ray sources. We then visually inspected and assigned spectral type to each spectrum and calculated the equivalent width (EW) of Ha line using the Hammer spectral typing facility. Based on the EW of H alpha line, we found 203 spectra of 145 X-ray sources with H alpha emission above the continuum. For these spectra we also measured the EWs of H beta, H gamma, H delta and Ca II IRT lines of these spectra. After removing novae, planetary nebulae and OB-type stars, we found there are 127 X-ray late-type stars with Ha line emission. By using our spectra and results from the literature, we found 53 X-ray stars showing H alpha variability; these objects are Classical T Tauri stars (CTTs), cataclysmic variables (CVs) or chromospheric activity stars. We also found 18 X-ray stars showing obvious emissions in the Ca II IRT lines. Of the 18 X-ray stars, 16 are CTTs and 2 are CVs. Finally, we discussed the relationships between the EW of Ha line and X-ray flux.
关键词Stars: Chromospheres Stars: Activity Stars: X-ray Stars: Spectroscopic
学科领域天文学
DOI10.1007/s10509-018-3328-8
项目资助者National Development and Reform Commission ; NSFC(U1631236, U1431114, 11263001) ; Chinese Academy of Sciences (CAS)(U1631236, U1431114, 11263001) ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories(KLSA201806)
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收录类别SCI
语种英语
文章类型Article
WOS研究方向Astronomy & Astrophysics
WOS标题词Science & Technology ; Physical Sciences
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000431355300024
关键词[WOS]T-TAURI STARS ; MAIN-SEQUENCE STARS ; HIGH-RESOLUTION SPECTROSCOPY ; EMISSION-LINE STARS ; DIGITAL SKY SURVEY ; NORTH GALACTIC POLE ; CATACLYSMIC VARIABLE CANDIDATES ; BRIGHT SOURCE CATALOG ; HERBIG AE/BE STARS ; AURIGA DARK CLOUDS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12362
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, Li-yun, Email: liy_zhang@hotmail.com
作者单位1.College of Physics/Department of Physics and Astronomy &
2.CAS Key Laboratory of Solar Activity, National Astronomical
3.Key Laboratory for the Structure and Evolution of Celestial
4.Dept. of Physics and Astronomy, Butler University, Indianapolis,
5.National Astronomical Observatories, Chinese Academy of
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Lu, Hong-peng,Zhang, Li-yun,Han, Xianming L.,et al. X-ray stars observed in LAMOST spectral survey[J]. ASTROPHYSICS AND SPACE SCIENCE,2018,363(5).
APA Lu, Hong-peng,Zhang, Li-yun,Han, Xianming L.,Shi, Jianrong,&Zhang, Li-yun, Email: liy_zhang@hotmail.com.(2018).X-ray stars observed in LAMOST spectral survey.ASTROPHYSICS AND SPACE SCIENCE,363(5).
MLA Lu, Hong-peng,et al."X-ray stars observed in LAMOST spectral survey".ASTROPHYSICS AND SPACE SCIENCE 363.5(2018).
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